The line that is drawn perpendicular to the point at which a wave intersects a boundary is known as the normal.
What is a wave?
A wave is a disturbance that travels through a medium and transfers energy from one point to another.
For a boundary, a line perpendicuar to the ne that is drawn perpendicular to the point at which a wave intersects a boundary is at 90 degrees to the boundary.
Being at right angle to the boundary means that the line is a normal line.
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